Question: his Boolean function takes a nonempty numerical list of lists ( hereafter referred to as a matrix ) as its sole argument and returns True

his Boolean function takes a nonempty numerical list of lists (hereafter referred to as
a matrix) as its sole argument and returns True if the argument is a diagonal matrix, False otherwise.
In diagonal matrices, all off-diagonal elements are zero. See the test for examples of calls to
is_diagonal and the correct corresponding return values. Examples of diagonal matrices

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